18 out of 21 as a percentage
18 / 21 x 100 = 85.7%
Letter grades here use the standard 10-point scale (A 90+, B 80+, C 70+, D 60+, F below 60). Your school's scale may differ — check your syllabus, or use the Test Grade Calculator where the scale is configurable.
How to Calculate 18 out of 21 as a Percentage
Divide the numerator by the denominator, then multiply by 100. Using the real numbers:
percent = (X / Y) x 100
percent = (18 / 21) x 100
percent = 0.8571 x 100 = 85.7%
On the standard 10-point letter-grade scale, 85.7% maps to a letter grade of B, which carries a GPA value of 3.0.
Is 18 out of 21 a Good Score?
85.7% is a solid, above-average score. Getting 18 out of 21 correct shows a good understanding of the subject. A B grade is respectable and signals you have a firm grasp of the core concepts, even if there is room to push into A territory.
Score Reference Table — Out of 21
All 22 possible scores on a 21-point assessment, with percentages and letter grades. Your score is highlighted.
| Score | Percentage | Letter |
|---|---|---|
| 21/21 | 100% | A |
| 20/21 | 95.2% | A |
| 19/21 | 90.5% | A |
| 18/21 | 85.7% | B |
| 17/21 | 81% | B |
| 16/21 | 76.2% | C |
| 15/21 | 71.4% | C |
| 14/21 | 66.7% | D |
| 13/21 | 61.9% | D |
| 12/21 | 57.1% | F |
| 11/21 | 52.4% | F |
| 10/21 | 47.6% | F |
| 9/21 | 42.9% | F |
| 8/21 | 38.1% | F |
| 7/21 | 33.3% | F |
| 6/21 | 28.6% | F |
| 5/21 | 23.8% | F |
| 4/21 | 19% | F |
| 3/21 | 14.3% | F |
| 2/21 | 9.5% | F |
| 1/21 | 4.8% | F |
| 0/21 | 0% | F |
Letter Grade Breakdown
- A — 90% and above (4.0 GPA)
- B — 80%–89.9% (3.0 GPA)
- C — 70%–79.9% (2.0 GPA)
- D — 60%–69.9% (1.0 GPA)
- F — below 60% (0.0 GPA)
Grade a Test with These Numbers
If you answered 18 out of 21 questions correctly, your score is 85.7% — a letter grade of B. You got 3 questions wrong.
Use the Test Grade Calculator (pre-filled for 21 questions, 3 wrong) for a full grading-scale table. Or convert any percentage with the Percent to Letter Grade converter.
Frequently Asked Questions
What is 18 out of 21 as a percentage?
18 out of 21 as a percentage is 85.7%. The formula is (18 divided by 21) times 100 = 85.7%. On the standard 10-point grading scale that is a B (3.0 GPA).
Is 18 out of 21 a passing grade?
Yes — 85.7% (18/21) is a passing score on the standard 10-point scale. It earns a letter grade of B. Most courses require at least 60% (a D) to pass, though some programs require a C (70%) or higher for credit toward your major.
How many questions did I get wrong if I scored 18 out of 21?
You got 3 questions wrong out of 21. That is 14.3% incorrect, leaving you with a score of 85.7% (B).
Nearby Scores — Out of 21
- 17 out of 21 = 81% (B)
- 18 out of 21 = 85.7% (B) — current
- 19 out of 21 = 90.5% (A)